Improvement in sewing-machines



3: Sheets-Sheet 1.

G. SLATER.

Sewing Machine.

No. 77,665. v Patented May 5 1868.

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Sewing Machine.

Patented May 5, 1868.-

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GEORGE SLATER, OF LONDON, ENGLAND, ASSIGNOR TO' GEORGE WASH-.

INGTON BELDING, OE SAME PLACE.

' Letters mam No. vases, dated [May 5, 1868.

IMPROVEMENT IN SEWING-MACHINES. v

TO ALL'WHOM IT MAY CONCERN:

Be it known that I, GEORGE SLATER, of London, England, have invented a certain new and useful Improve ment inSewing'h'Iachinesf and I do hereby declare that the following is a. fullland exact description of the same, reference being bad to the accompanying drawings, forming a part of this specification.

The said improvement relates to that class of sewing-machines in which a thread, carried by a needle, descends through the cloth or other fabric, and is secured therein by asecond thread, carried by a shuttle thrown to and fro below the'said fabric, the two threads being interlaced or combined in the fabric, in the form of stitch known as' the lock-stitch.

The said improvement consists chiefly inthe employment, in such a machine, of twovibrating-shafts, one of which is provided with an arm or lever to operate the shuttle-carrier, and the other with a cam for operating the feed-bar. Each of theseiribrating-shafts is operated by a separate eccentricortthe' driving-shaft, and that one Which operates the shuttle. is made hollow or tubular from end to end, the other shaft being passed through the same. s l

Description of the Drawings.

Figure 1 is a pla or top viewof my improved sewing-machine.

Figure 2 is a side elevation of the said machine.

Figure 3 is a front elevation of the same.

Figures 4 and 5 represent detached portions of the said machine.

Like letters indicate the same parts in each figure.

The frame A of the machine is made of cast iron or other suitable material, and of .any 'convenient 101111 and size, and is provided with a base orfoot, A, by which the machine may be secured to a. table or bench. Bearings A are formed in the upper part of the said frame, to support the driving-shaft B. The front end of the latter carries a crank, O, which is provided with a pin or stu'df G, at its o'utcr extremity. This pin is fitted to work in a V-shaped groove, D, formed in a block, D, attached to the needle-bar E, the point or apex of the said groove being downward, and rounded or curved to correspond with the radius of the crank, C. The object of forming the said groove in this manner is to cause a slight stoppage and return movement of the needle F immediately after the'comm'encementof its upward stroke, which return movement produces a loop or how in the needle-thread under the fabric, and allows the shuttle to pass freely across the same. The form of the groove D may be varied in any way which will cause .it to impart this peculiar motion to'the needle F, by the action of the pin of the crank C in the said groove. I p i i The rear end of the driving-shaft B is furnished with two eccentrics, G H, each of which, bymeans of a suitable rod, I, operates one of the rocking-shafts J K, the said shafts being provided with cranks or disks G H, which have pins for the eccentric-rods I to-take hold upon. The rocking-shaft J, for operating thcvshuttle M, is supported in suitable bearings formed in the frame A. This shaft is made hollow or tubular, and large enough to allow'the other shaft, K, to pass freely through its centre. The outer shaft, J, is hushed or swaged down at each end, J, and bearings are formed therein for the inner shaft, K. The arm or lever N, for 0perating the shuttle-carrier O, is providedwith a pin or stud, N, which is fitted to work freely in a vertical aperture or slot, .19, formed in the plate P, projecting downward from the said carrier. The latter is formed with two arms, 0, on its upper portion, and holes are formed in the said arms to fit a guide-rod, Q, which extends across the under side of the'clo'th-plate R, parallel with the shuttle-race R. The said shuttle-race is a groove or channel, extendingfrom side to side, below the surface of the cloth-plate R. A longitudinal aperture is formed on one side of this'channel, to admit two fingers or claws, 0 extending from .the shuttle-carrier O, and the shuttle M lies between these fingers, and is carried with them as the carrier is thrown to and fro by the vibration of the crank-arm N.

The device for taking up the needlesthrcad is clearly shown in fig. 3. The lever S, which has two arms,

Sgis supported to vibrate freely upon a pivot or fulcrum, T, about midway between the said arms, this pivot :ing securediu a plate, 'U, attached to the end of the frame in front of the needle-bar guide A One of these ms, or a third arm, S is arranged to come in contact with an adjustable projecting stud or finger, E, attached the needle-bar E, or to the block D on the same. The thread is brought from a reel or bobbin, V, through tension-device of the usual construction, and is passed through a guide, W, attached to the frame, just above e needle-bar guide A From this guide the thread passes through an eye in each arm, S S of the vibratingver S, and thence through another guide, W, to the needle. The vibrating-lever S,and stud E", for operating e some, are so arranged that the arm S is thrown up by the said stud as each stitch is formed, the thread at .e same time passing freely through the eyes in the'two arms, S 8?, of thesaid lever.

The feeding-device consists of a reciprocating plate or bar, X, which is operated by a cam, Y, and regulated r a screw, 2, in the usual manner. The said lever is supported at one end by a pin or stud, a, which passes rough a longitudinal slot, 6, in the plate or' bar X, andis secured in the side of the shuttle-race R. The c to has two projections, one of whi c h, Y imparts a longitudinal motion, and the other, Y a vibrating motion the feed-bar X, which is kept down upon the cam by a spring, 0, attached to the under side of the cloth-plate .The resser-foot d is formed with an aperture, al through which the needle works. The rod e'of the said ot'has a projection, d, which extends over the edge of the cam), and by turning the saidcam on its axis or vot g, the foot is raised or lowered as desired. a r 1 V The shuttle M, is, preferably, provided" with a curved cushion, attached to a spring, and arranged to bear ion the thread on the reel or bobbin, and assist in producing the proper tension on the same This shuttle )es not form part of my invention, as a similar one has been previously used in sewing-machines. The wheel pulley 1; may be fitted to turn upon a pin or stud, 2', and provided with a toothed pinion, j, as shown, geared itc another pinion, j, on the driving-shaft B, or the pulley k may he'fixed upon the end of the driving-shaft. he pulley h is provided with a handle, h, and may be turned either by hand, or by means of abelt passing 'cr the said pulley. I

The winding-apparatus for filling the reel or bobbin of thc shuttle M is shown in figs. 1 and 2. The small illey k, on the end of thc short spindle l, is furnished with a ring, of India rubber or-other similar mate al, which, when the device is properly adjusted, runs in contact with the wheel is, and causes the said spindle revolve rapidly. The'bracket n, which carries the short spindle l, is pivoted at o' to the frame A. The spring a which is secured to this frame, is so formed and arranged as to hold the bracket 12, when the pulleyl is ljusted either in or out of contact with the wheel It, and no other locking means are required to keep the said what in either of such positions. When the winding-device is used, the bobbin is placed between thccentres and q, and the said device isadjusted as shown in fig. 1, and the wheel 7; being caused torotate, the said bob :1 is quickly filled with thread.

To hold my improved machine firmly'while-at work, without clamps, screws, or other similar means, I uploy pieces or feet, of cork, which are placed in small sockets, or otherwise attached to the base of the achine. The friction between the surface of the cork and that of the table or bench is suflicient to hold the achine, and prevents its shifting while in operation, but will allow it to be easily removcdwhen desired. lsteadof these pieces of cork,'I sometimes-make use of pneumatic pressure to hold-the machine upon its table stand, and I prefer to obtain this pressure by means of a disk or number of-disks, or washers, of India rubber other similar substance, attached to the base, A. The said disks or washers may be provided with screws, other means whereby they can be'pressed firmly in contact with the surface on which they rest, and this sur ce should be made smooth and true, t'o insure the perfect adhesion of the disks. These cork feet or pneumatic .pports greatly diminish the noise of the machinoin working.

'What I claim as myinvcntion, anddesire to secure by Letters Patent, is-- V A simple rocking-shaft, K, and anencircling, tubhlar rocking-shaft, J, combined with each other, and' ispecti vely, at one end, with a'cam, Y, operating the feed-plat'e-X, and lover N, operating the shuttle-carrier,

, and at the other-{with the eccentrics Gr H, upon. the driving-shaft of a sewing-machine, all substantially in e manner and for the purpose herein set forth. A

- GEORGE SLATER.

Witnesses:-

WM. RoBr Larch, Tnos. N. PALMER.- 

